/*
 * Copyright The Apache Software Foundation
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.hbase.util;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.UndeclaredThrowableException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class Methods {
	private static Log LOG = LogFactory.getLog(Methods.class);

	public static <T> Object call(Class<T> clazz, T instance, String methodName, Class<?>[] types, Object[] args) throws Exception {
		try {
			Method m = clazz.getMethod(methodName, types);
			return m.invoke(instance, args);
		} catch (IllegalArgumentException arge) {
			LOG.fatal(
					"Constructed invalid call. class=" + clazz.getName() + " method=" + methodName + " types="
							+ Classes.stringify(types), arge);
			throw arge;
		} catch (NoSuchMethodException nsme) {
			throw new IllegalArgumentException("Can't find method " + methodName + " in " + clazz.getName() + "!", nsme);
		} catch (InvocationTargetException ite) {
			// unwrap the underlying exception and rethrow
			if (ite.getTargetException() != null) {
				if (ite.getTargetException() instanceof Exception) {
					throw (Exception) ite.getTargetException();
				} else if (ite.getTargetException() instanceof Error) {
					throw (Error) ite.getTargetException();
				}
			}
			throw new UndeclaredThrowableException(ite, "Unknown exception invoking " + clazz.getName() + "." + methodName + "()");
		} catch (IllegalAccessException iae) {
			throw new IllegalArgumentException("Denied access calling " + clazz.getName() + "." + methodName + "()", iae);
		} catch (SecurityException se) {
			LOG.fatal("SecurityException calling method. class=" + clazz.getName() + " method=" + methodName + " types="
					+ Classes.stringify(types), se);
			throw se;
		}
	}
}
